18 



Mycologia 



Known only from Wright's collections in Cuba. The species, 

 which has the same habitat as the previous one, may be distin- 

 guished by its smaller size and smaller spores, the latter being 

 only 7X4/^. It is just possible that this species is only a small, 

 immature form of D. bullacea, but there is little chance of proving 

 it. I have examined the spores of the type specimens and find 

 them as represented. 



3. Atylospora Fayod, Ann. Sci. Nat. VII. 9 : 376. 1889 



Psathyra Quel. Champ. Jura Vosg. 118. 1872. Not Psathyra 

 vSpreng. 181 8. Not Psathura Commers. 1789. 



Pluteopsis Fayod, Ann. Sci. Nat. VII. 9: 377. 1889. 



This rather difficult genus, well represented both in temperate 



and tropical regions, is characterized by a cartilaginous stipe, a 



straight margin appressed when young, and the absence of a veil. 



It is difficult to distinguish in the herbarium from Psilocybe 



and Drosophila. Psathyrella differs in having black spores, but 



even here it is at times hard to draw the line. 



Pileus white with blackish squamules, becoming smooth and purplish-brown 



with age. i. A. tigrina. 



Pileus not as above. 



Pileus 3-10 mm. broad. 



Stipe 5 mm. long ; pileus avellaneous. 



2. 



A. 



diminutiva. 



Stipe 1-2 cm. long. 









Pileus whitish. 



3- 



A. 



commiscibilis. 



Pileus yellow. 



4- 



A. 



epibates. 



Pileus red. 



5- 



A. 



lateritia. 



Pileus pinkish-gray. 



6. 



A. 



by s sin a. 



Pileus pale-umbrinous. 



7- 



A. 



euthugramma. 



Pileus 1—2 cm. broad. 









Pileus white when moist, fulvous or umbrinous 









when dry. 









Stipe about i cm. long. 



8. 



A. 



coprinoceps. 



Stipe reaching 4 cm. long. 



9- 



A. 



Musae. 



Pileus uniformly avellaneous-isabelline. 



10. 



A. 



mexicana. 



Pileus pale-avellaneous, isabelline on the disk. 



1 1. 



A. 



albipes. 



Pileus sordid-luteous. 



12. 



A. 



bulbillosa. 



Pileus pale-fulvous with a peculiar sheen. 



13. 



A. 



pallidispora. 



Pileus bay, chestnut, or brown. 









Pileus not umbonate, slightly depressed. 



14- 



A. 



cubensis. 



Pileus umbonate. 









Surface decorated with white scales. 



is.. 



A. 



plumigera. 



Surface glabrous. 



